Merge pull request #1106 from tperard/network-module-reword

Network module rework

include/modules/network.hpp

@@ -2,9 +2,7 @@
 
 #include <arpa/inet.h>
 #include <fmt/format.h>
-#include <ifaddrs.h>
 #include <linux/nl80211.h>
-#include <net/if.h>
 #include <netlink/genl/ctrl.h>
 #include <netlink/genl/genl.h>
 #include <netlink/netlink.h>
@@ -28,23 +26,20 @@ class Network : public ALabel {
   static const uint8_t EPOLL_MAX = 200;
 
   static int handleEvents(struct nl_msg*, void*);
+  static int handleEventsDone(struct nl_msg*, void*);
   static int handleScan(struct nl_msg*, void*);
 
+  void askForStateDump(void);
+
   void              worker();
   void              createInfoSocket();
   void              createEventSocket();
-  int               getExternalInterface(int skip_idx = -1) const;
-  void              getInterfaceAddress();
-  int               netlinkRequest(void*, uint32_t, uint32_t groups = 0) const;
-  int               netlinkResponse(void*, uint32_t, uint32_t groups = 0) const;
   void              parseEssid(struct nlattr**);
   void              parseSignal(struct nlattr**);
   void              parseFreq(struct nlattr**);
   bool              associatedOrJoined(struct nlattr**);
-  bool              checkInterface(struct ifinfomsg* rtif, std::string name);
+  bool              checkInterface(std::string name);
-  int               getPreferredIface(int skip_idx = -1, bool wait = true) const;
   auto              getInfo() -> void;
-  void              checkNewInterface(struct ifinfomsg* rtif);
   const std::string getNetworkState() const;
   void              clearIface();
   bool              wildcardMatch(const std::string& pattern, const std::string& text) const;
@@ -59,11 +54,17 @@ class Network : public ALabel {
   int                nl80211_id_;
   std::mutex         mutex_;
 
+  bool               want_route_dump_;
+  bool               want_link_dump_;
+  bool               want_addr_dump_;
+  bool               dump_in_progress_;
+
   unsigned long long bandwidth_down_total_;
   unsigned long long bandwidth_up_total_;
 
   std::string state_;
   std::string essid_;
+  bool        carrier_;
   std::string ifname_;
   std::string ipaddr_;
   std::string netmask_;

src/modules/network.cpp

@@ -86,13 +86,24 @@ waybar::modules::Network::Network(const std::string &id, const Json::Value &conf
       family_(config["family"] == "ipv6" ? AF_INET6 : AF_INET),
       efd_(-1),
       ev_fd_(-1),
-      cidr_(-1),
+      want_route_dump_(false),
+      want_link_dump_(false),
+      want_addr_dump_(false),
+      dump_in_progress_(false),
+      cidr_(0),
       signal_strength_dbm_(0),
       signal_strength_(0),
 #ifdef WANT_RFKILL
       rfkill_{RFKILL_TYPE_WLAN},
 #endif
       frequency_(0) {
+
+  // Start with some "text" in the module's label_, update() will then
+  // update it. Since the text should be different, update() will be able
+  // to show or hide the event_box_. This is to work around the case where
+  // the module start with no text, but the the event_box_ is shown.
+  label_.set_markup("<s></s>");
+
   auto down_octets = read_netstat(BANDWIDTH_CATEGORY, BANDWIDTH_DOWN_TOTAL_KEY);
   auto up_octets = read_netstat(BANDWIDTH_CATEGORY, BANDWIDTH_UP_TOTAL_KEY);
   if (down_octets) {
@@ -107,17 +118,25 @@ waybar::modules::Network::Network(const std::string &id, const Json::Value &conf
     bandwidth_up_total_ = 0;
   }
 
+  if (!config_["interface"].isString()) {
+    // "interface" isn't configure, then try to guess the external
+    // interface currently used for internet.
+    want_route_dump_ = true;
+  } else {
+    // Look for an interface that match "interface"
+    // and then find the address associated with it.
+    want_link_dump_ = true;
+    want_addr_dump_ = true;
+  }
+
   createEventSocket();
   createInfoSocket();
-  auto default_iface = getPreferredIface(-1, false);
+
-  if (default_iface != -1) {
-    ifid_ = default_iface;
-    char ifname[IF_NAMESIZE];
-    if_indextoname(default_iface, ifname);
-    ifname_ = ifname;
-    getInterfaceAddress();
-  }
   dp.emit();
+  // Ask for a dump of interfaces and then addresses to populate our
+  // information. First the interface dump, and once done, the callback
+  // will be called again which will ask for addresses dump.
+  askForStateDump();
   worker();
 }
 
@@ -148,17 +167,29 @@ void waybar::modules::Network::createEventSocket() {
   ev_sock_ = nl_socket_alloc();
   nl_socket_disable_seq_check(ev_sock_);
   nl_socket_modify_cb(ev_sock_, NL_CB_VALID, NL_CB_CUSTOM, handleEvents, this);
+  nl_socket_modify_cb(ev_sock_, NL_CB_FINISH, NL_CB_CUSTOM, handleEventsDone, this);
   auto groups = RTMGRP_LINK | (family_ == AF_INET ? RTMGRP_IPV4_IFADDR : RTMGRP_IPV6_IFADDR);
   nl_join_groups(ev_sock_, groups);  // Deprecated
   if (nl_connect(ev_sock_, NETLINK_ROUTE) != 0) {
     throw std::runtime_error("Can't connect network socket");
   }
+  if (nl_socket_set_nonblocking(ev_sock_)) {
+    throw std::runtime_error("Can't set non-blocking on network socket");
+  }
   nl_socket_add_membership(ev_sock_, RTNLGRP_LINK);
   if (family_ == AF_INET) {
     nl_socket_add_membership(ev_sock_, RTNLGRP_IPV4_IFADDR);
   } else {
     nl_socket_add_membership(ev_sock_, RTNLGRP_IPV6_IFADDR);
   }
+  if (!config_["interface"].isString()) {
+    if (family_ == AF_INET) {
+      nl_socket_add_membership(ev_sock_, RTNLGRP_IPV4_ROUTE);
+    } else {
+      nl_socket_add_membership(ev_sock_, RTNLGRP_IPV6_ROUTE);
+    }
+  }
+
   efd_ = epoll_create1(EPOLL_CLOEXEC);
   if (efd_ < 0) {
     throw std::runtime_error("Can't create epoll");
@@ -228,7 +259,23 @@ void waybar::modules::Network::worker() {
     int ec = epoll_wait(efd_, events.data(), EPOLL_MAX, -1);
     if (ec > 0) {
       for (auto i = 0; i < ec; i++) {
-        if (events[i].data.fd != nl_socket_get_fd(ev_sock_) || nl_recvmsgs_default(ev_sock_) < 0) {
+        if (events[i].data.fd == nl_socket_get_fd(ev_sock_)) {
+          int rc = 0;
+          // Read as many message as possible, until the socket blocks
+          while (true) {
+            errno = 0;
+            rc = nl_recvmsgs_default(ev_sock_);
+            if (rc == -NLE_AGAIN || errno == EAGAIN) {
+              rc = 0;
+              break;
+            }
+          }
+          if (rc < 0) {
+            spdlog::error("nl_recvmsgs_default error: {}", nl_geterror(-rc));
+            thread_.stop();
+            break;
+          }
+        } else {
           thread_.stop();
           break;
         }
@@ -245,6 +292,7 @@ const std::string waybar::modules::Network::getNetworkState() const {
 #endif
     return "disconnected";
   }
+  if (!carrier_) return "disconnected";
   if (ipaddr_.empty()) return "linked";
   if (essid_.empty()) return "ethernet";
   return "wifi";
@@ -342,349 +390,312 @@ auto waybar::modules::Network::update() -> void {
   ALabel::update();
 }
 
-// Based on https://gist.github.com/Yawning/c70d804d4b8ae78cc698
+bool waybar::modules::Network::checkInterface(std::string name) {
-int waybar::modules::Network::getExternalInterface(int skip_idx) const {
-  static const uint32_t route_buffer_size = 8192;
-  struct nlmsghdr *     hdr = nullptr;
-  struct rtmsg *        rt = nullptr;
-  char                  resp[route_buffer_size] = {0};
-  int                   ifidx = -1;
-
-  /* Prepare request. */
-  constexpr uint32_t reqlen = NLMSG_SPACE(sizeof(*rt));
-  char               req[reqlen] = {0};
-
-  /* Build the RTM_GETROUTE request. */
-  hdr = reinterpret_cast<struct nlmsghdr *>(req);
-  hdr->nlmsg_len = NLMSG_LENGTH(sizeof(*rt));
-  hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP;
-  hdr->nlmsg_type = RTM_GETROUTE;
-  rt = static_cast<struct rtmsg *>(NLMSG_DATA(hdr));
-  rt->rtm_family = family_;
-  rt->rtm_table = RT_TABLE_MAIN;
-
-  /* Issue the query. */
-  if (netlinkRequest(req, reqlen) < 0) {
-    goto out;
-  }
-
-  /* Read the response(s).
-   *
-   * WARNING: All the packets generated by the request must be consumed (as in,
-   * consume responses till NLMSG_DONE/NLMSG_ERROR is encountered).
-   */
-  do {
-    auto len = netlinkResponse(resp, route_buffer_size);
-    if (len < 0) {
-      goto out;
-    }
-
-    /* Parse the response payload into netlink messages. */
-    for (hdr = reinterpret_cast<struct nlmsghdr *>(resp); NLMSG_OK(hdr, len);
-         hdr = NLMSG_NEXT(hdr, len)) {
-      if (hdr->nlmsg_type == NLMSG_DONE) {
-        goto out;
-      }
-      if (hdr->nlmsg_type == NLMSG_ERROR) {
-        /* Even if we found the interface index, something is broken with the
-         * netlink socket, so return an error.
-         */
-        ifidx = -1;
-        goto out;
-      }
-
-      /* If we found the correct answer, skip parsing the attributes. */
-      if (ifidx != -1) {
-        continue;
-      }
-
-      /* Find the message(s) concerting the main routing table, each message
-       * corresponds to a single routing table entry.
-       */
-      rt = static_cast<struct rtmsg *>(NLMSG_DATA(hdr));
-      if (rt->rtm_table != RT_TABLE_MAIN) {
-        continue;
-      }
-
-      /* Parse all the attributes for a single routing table entry. */
-      struct rtattr *attr = RTM_RTA(rt);
-      uint64_t       attrlen = RTM_PAYLOAD(hdr);
-      bool           has_gateway = false;
-      bool           has_destination = false;
-      int            temp_idx = -1;
-      for (; RTA_OK(attr, attrlen); attr = RTA_NEXT(attr, attrlen)) {
-        /* Determine if this routing table entry corresponds to the default
-         * route by seeing if it has a gateway, and if a destination addr is
-         * set, that it is all 0s.
-         */
-        switch (attr->rta_type) {
-          case RTA_GATEWAY:
-            /* The gateway of the route.
-             *
-             * If someone every needs to figure out the gateway address as well,
-             * it's here as the attribute payload.
-             */
-            has_gateway = true;
-            break;
-          case RTA_DST: {
-            /* The destination address.
-             * Should be either missing, or maybe all 0s.  Accept both.
-             */
-            const uint32_t nr_zeroes = (family_ == AF_INET) ? 4 : 16;
-            unsigned char  c = 0;
-            size_t         dstlen = RTA_PAYLOAD(attr);
-            if (dstlen != nr_zeroes) {
-              break;
-            }
-            for (uint32_t i = 0; i < dstlen; i += 1) {
-              c |= *((unsigned char *)RTA_DATA(attr) + i);
-            }
-            has_destination = (c == 0);
-            break;
-          }
-          case RTA_OIF:
-            /* The output interface index. */
-            temp_idx = *static_cast<int *>(RTA_DATA(attr));
-            break;
-          default:
-            break;
-        }
-      }
-      /* If this is the default route, and we know the interface index,
-       * we can stop parsing this message.
-       */
-      if (has_gateway && !has_destination && temp_idx != -1 && temp_idx != skip_idx) {
-        ifidx = temp_idx;
-        break;
-      }
-    }
-  } while (true);
-
-out:
-  return ifidx;
-}
-
-void waybar::modules::Network::getInterfaceAddress() {
-  struct ifaddrs *ifaddr, *ifa;
-  cidr_ = 0;
-  int success = getifaddrs(&ifaddr);
-  if (success != 0) {
-    return;
-  }
-  ifa = ifaddr;
-  while (ifa != nullptr) {
-    if (ifa->ifa_addr != nullptr && ifa->ifa_addr->sa_family == family_ &&
-        ifa->ifa_name == ifname_) {
-      char ipaddr[INET6_ADDRSTRLEN];
-      char netmask[INET6_ADDRSTRLEN];
-      unsigned int cidr = 0;
-      if (family_ == AF_INET) {
-        ipaddr_ = inet_ntop(AF_INET,
-                            &reinterpret_cast<struct sockaddr_in *>(ifa->ifa_addr)->sin_addr,
-                            ipaddr,
-                            INET_ADDRSTRLEN);
-        auto net_addr = reinterpret_cast<struct sockaddr_in *>(ifa->ifa_netmask);
-        netmask_ = inet_ntop(AF_INET, &net_addr->sin_addr, netmask, INET_ADDRSTRLEN);
-        unsigned int cidrRaw = net_addr->sin_addr.s_addr;
-        while (cidrRaw) {
-          cidr += cidrRaw & 1;
-          cidrRaw >>= 1;
-        }
-      } else {
-        ipaddr_ = inet_ntop(AF_INET6,
-                            &reinterpret_cast<struct sockaddr_in6 *>(ifa->ifa_addr)->sin6_addr,
-                            ipaddr,
-                            INET6_ADDRSTRLEN);
-        auto net_addr = reinterpret_cast<struct sockaddr_in6 *>(ifa->ifa_netmask);
-        netmask_ = inet_ntop(AF_INET6, &net_addr->sin6_addr, netmask, INET6_ADDRSTRLEN);
-        for (size_t i = 0; i < sizeof(net_addr->sin6_addr.s6_addr); ++i) {
-          unsigned char cidrRaw = net_addr->sin6_addr.s6_addr[i];
-          while (cidrRaw) {
-            cidr += cidrRaw & 1;
-            cidrRaw >>= 1;
-          }
-        }
-      }
-      cidr_ = cidr;
-      break;
-    }
-    ifa = ifa->ifa_next;
-  }
-  freeifaddrs(ifaddr);
-}
-
-int waybar::modules::Network::netlinkRequest(void *req, uint32_t reqlen, uint32_t groups) const {
-  struct sockaddr_nl sa = {};
-  sa.nl_family = AF_NETLINK;
-  sa.nl_groups = groups;
-  struct iovec  iov = {req, reqlen};
-  struct msghdr msg = {
-      .msg_name = &sa,
-      .msg_namelen = sizeof(sa),
-      .msg_iov = &iov,
-      .msg_iovlen = 1,
-  };
-  return sendmsg(nl_socket_get_fd(ev_sock_), &msg, 0);
-}
-
-int waybar::modules::Network::netlinkResponse(void *resp, uint32_t resplen, uint32_t groups) const {
-  struct sockaddr_nl sa = {};
-  sa.nl_family = AF_NETLINK;
-  sa.nl_groups = groups;
-  struct iovec  iov = {resp, resplen};
-  struct msghdr msg = {
-      .msg_name = &sa,
-      .msg_namelen = sizeof(sa),
-      .msg_iov = &iov,
-      .msg_iovlen = 1,
-  };
-  auto ret = recvmsg(nl_socket_get_fd(ev_sock_), &msg, 0);
-  if (msg.msg_flags & MSG_TRUNC) {
-    return -1;
-  }
-  return ret;
-}
-
-bool waybar::modules::Network::checkInterface(struct ifinfomsg *rtif, std::string name) {
   if (config_["interface"].isString()) {
     return config_["interface"].asString() == name ||
            wildcardMatch(config_["interface"].asString(), name);
   }
-  // getExternalInterface may need some delay to detect external interface
-  for (uint8_t tries = 0; tries < MAX_RETRY; tries += 1) {
-    auto external_iface = getExternalInterface();
-    if (external_iface > 0) {
-      return external_iface == rtif->ifi_index;
-    }
-    std::this_thread::sleep_for(std::chrono::milliseconds(500));
-  }
   return false;
 }
 
-int waybar::modules::Network::getPreferredIface(int skip_idx, bool wait) const {
-  int ifid = -1;
-  if (config_["interface"].isString()) {
-    ifid = if_nametoindex(config_["interface"].asCString());
-    if (ifid > 0) {
-      return ifid;
-    } else {
-      // Try with wildcard
-      struct ifaddrs *ifaddr, *ifa;
-      int             success = getifaddrs(&ifaddr);
-      if (success != 0) {
-        return -1;
-      }
-      ifa = ifaddr;
-      ifid = -1;
-      while (ifa != nullptr) {
-        if (wildcardMatch(config_["interface"].asString(), ifa->ifa_name)) {
-          ifid = if_nametoindex(ifa->ifa_name);
-          break;
-        }
-        ifa = ifa->ifa_next;
-      }
-      freeifaddrs(ifaddr);
-      return ifid;
-    }
-  }
-  // getExternalInterface may need some delay to detect external interface
-  for (uint8_t tries = 0; tries < MAX_RETRY; tries += 1) {
-    ifid = getExternalInterface(skip_idx);
-    if (ifid > 0) {
-      return ifid;
-    }
-    if (wait) {
-      std::this_thread::sleep_for(std::chrono::milliseconds(500));
-    }
-  }
-  return -1;
-}
-
 void waybar::modules::Network::clearIface() {
+  ifid_ = -1;
   essid_.clear();
   ipaddr_.clear();
   netmask_.clear();
+  carrier_ = false;
   cidr_ = 0;
   signal_strength_dbm_ = 0;
   signal_strength_ = 0;
   frequency_ = 0;
 }
 
-void waybar::modules::Network::checkNewInterface(struct ifinfomsg *rtif) {
-  auto new_iface = getPreferredIface(rtif->ifi_index);
-  if (new_iface != -1) {
-    ifid_ = new_iface;
-    char ifname[IF_NAMESIZE];
-    if_indextoname(new_iface, ifname);
-    ifname_ = ifname;
-    getInterfaceAddress();
-    thread_timer_.wake_up();
-  } else {
-    ifid_ = -1;
-    dp.emit();
-  }
-}
-
 int waybar::modules::Network::handleEvents(struct nl_msg *msg, void *data) {
   auto                        net = static_cast<waybar::modules::Network *>(data);
   std::lock_guard<std::mutex> lock(net->mutex_);
   auto                        nh = nlmsg_hdr(msg);
-  auto                        ifi = static_cast<struct ifinfomsg *>(NLMSG_DATA(nh));
+  bool                        is_del_event = false;
-  if (nh->nlmsg_type == RTM_DELADDR) {
+
-    // Check for valid interface
+  switch (nh->nlmsg_type) {
-    if (ifi->ifi_index == net->ifid_) {
+  case RTM_DELLINK:
-      net->ipaddr_.clear();
+    is_del_event = true;
-      net->netmask_.clear();
+  case RTM_NEWLINK: {
-      net->cidr_ = 0;
+    struct ifinfomsg *ifi = static_cast<struct ifinfomsg *>(NLMSG_DATA(nh));
-      if (!(ifi->ifi_flags & IFF_RUNNING)) {
+    ssize_t attrlen = IFLA_PAYLOAD(nh);
-        net->clearIface();
+    struct rtattr *ifla = IFLA_RTA(ifi);
-        // Check for a new interface and get info
+    const char *ifname = NULL;
-        net->checkNewInterface(ifi);
+    size_t ifname_len = 0;
-      } else {
+    bool carrier = false;
-        net->dp.emit();
+
-      }
+    if (net->ifid_ != -1 && ifi->ifi_index != net->ifid_) {
       return NL_OK;
     }
-  } else if (nh->nlmsg_type == RTM_NEWLINK || nh->nlmsg_type == RTM_DELLINK) {
+
-    char ifname[IF_NAMESIZE];
+    for (; RTA_OK(ifla, attrlen); ifla = RTA_NEXT(ifla, attrlen)) {
-    if_indextoname(ifi->ifi_index, ifname);
+      switch (ifla->rta_type) {
-    // Check for valid interface
+      case IFLA_IFNAME:
-    if (ifi->ifi_index != net->ifid_ && net->checkInterface(ifi, ifname)) {
+        ifname = static_cast<const char *>(RTA_DATA(ifla));
-      net->ifname_ = ifname;
+        ifname_len = RTA_PAYLOAD(ifla) - 1; // minus \0
-      net->ifid_ = ifi->ifi_index;
+        break;
-      // Get Iface and WIFI info
+      case IFLA_CARRIER: {
-      net->getInterfaceAddress();
+        carrier = *(char*)RTA_DATA(ifla) == 1;
-      net->thread_timer_.wake_up();
+        break;
-      return NL_OK;
+      }
-    } else if (ifi->ifi_index == net->ifid_ &&
+      }
-               (!(ifi->ifi_flags & IFF_RUNNING) || !(ifi->ifi_flags & IFF_UP) ||
+    }
-                !net->checkInterface(ifi, ifname))) {
+
+    if (!is_del_event && ifi->ifi_index == net->ifid_) {
+      // Update inferface information
+      if (net->ifname_.empty()) {
+        std::string new_ifname (ifname, ifname_len);
+        net->ifname_ = new_ifname;
+      }
+      net->carrier_ = carrier;
+    } else if (!is_del_event && net->ifid_ == -1) {
+      // Checking if it's an interface we care about.
+      std::string new_ifname (ifname, ifname_len);
+      if (net->checkInterface(new_ifname)) {
+        spdlog::debug("network: selecting new interface {}/{}", new_ifname, ifi->ifi_index);
+
+        net->ifname_ = new_ifname;
+        net->ifid_ = ifi->ifi_index;
+        net->carrier_ = carrier;
+        net->thread_timer_.wake_up();
+        /* An address for this new interface should be received via an
+         * RTM_NEWADDR event either because we ask for a dump of both links
+         * and addrs, or because this interface has just been created and
+         * the addr will be sent after the RTM_NEWLINK event.
+         * So we don't need to do anything. */
+      }
+    } else if (is_del_event && net->ifid_ >= 0) {
+      // Our interface has been deleted, start looking/waiting for one we care.
+      spdlog::debug("network: interface {}/{} deleted", net->ifname_, net->ifid_);
+
       net->clearIface();
-      // Check for a new interface and get info
+      net->dp.emit();
-      net->checkNewInterface(ifi);
-      return NL_OK;
-    }
-  } else {
-    char ifname[IF_NAMESIZE];
-    if_indextoname(ifi->ifi_index, ifname);
-    // Auto detected network can also be assigned here
-    if (ifi->ifi_index != net->ifid_ && net->checkInterface(ifi, ifname)) {
-      // If iface is different, clear data
-      if (ifi->ifi_index != net->ifid_) {
-        net->clearIface();
-      }
-      net->ifname_ = ifname;
-      net->ifid_ = ifi->ifi_index;
-    }
-    // Check for valid interface
-    if (ifi->ifi_index == net->ifid_) {
-      // Get Iface and WIFI info
-      net->getInterfaceAddress();
-      net->thread_timer_.wake_up();
-      return NL_OK;
     }
+    break;
   }
-  return NL_SKIP;
+
+  case RTM_DELADDR:
+    is_del_event = true;
+  case RTM_NEWADDR: {
+    struct ifaddrmsg *ifa = static_cast<struct ifaddrmsg *>(NLMSG_DATA(nh));
+    ssize_t attrlen = IFA_PAYLOAD(nh);
+    struct rtattr *ifa_rta = IFA_RTA(ifa);
+
+    if ((int)ifa->ifa_index != net->ifid_) {
+      return NL_OK;
+    }
+
+    if (ifa->ifa_family != net->family_) {
+      return NL_OK;
+    }
+
+    // We ignore address mark as scope for the link or host,
+    // which should leave scope global addresses.
+    if (ifa->ifa_scope >= RT_SCOPE_LINK) {
+      return NL_OK;
+    }
+
+    for (; RTA_OK(ifa_rta, attrlen); ifa_rta = RTA_NEXT(ifa_rta, attrlen)) {
+      switch (ifa_rta->rta_type) {
+      case IFA_ADDRESS: {
+        char ipaddr[INET6_ADDRSTRLEN];
+        if (!is_del_event) {
+          net->ipaddr_ = inet_ntop(ifa->ifa_family, RTA_DATA(ifa_rta),
+                                   ipaddr, sizeof (ipaddr));
+          net->cidr_ = ifa->ifa_prefixlen;
+          switch (ifa->ifa_family) {
+          case AF_INET: {
+            struct in_addr netmask;
+            netmask.s_addr = htonl(~0 << (32 - ifa->ifa_prefixlen));
+            net->netmask_ = inet_ntop(ifa->ifa_family, &netmask,
+                                      ipaddr, sizeof (ipaddr));
+          }
+          case AF_INET6: {
+            struct in6_addr netmask;
+            for (int i = 0; i < 16; i++) {
+              int v = (i + 1) * 8 - ifa->ifa_prefixlen;
+              if (v < 0) v = 0;
+              if (v > 8) v = 8;
+              netmask.s6_addr[i] = ~0 << v;
+            }
+            net->netmask_ = inet_ntop(ifa->ifa_family, &netmask,
+                                      ipaddr, sizeof (ipaddr));
+          }
+          }
+          spdlog::debug("network: {}, new addr {}/{}", net->ifname_, net->ipaddr_, net->cidr_);
+        } else {
+          net->ipaddr_.clear();
+          net->cidr_ = 0;
+          net->netmask_.clear();
+          spdlog::debug("network: {} addr deleted {}/{}",
+                        net->ifname_,
+                        inet_ntop(ifa->ifa_family, RTA_DATA(ifa_rta),
+                                  ipaddr, sizeof (ipaddr)),
+                        ifa->ifa_prefixlen);
+        }
+        net->dp.emit();
+        break;
+      }
+      }
+    }
+    break;
+  }
+
+  case RTM_DELROUTE:
+    is_del_event = true;
+  case RTM_NEWROUTE: {
+    // Based on https://gist.github.com/Yawning/c70d804d4b8ae78cc698
+    // to find the interface used to reach the outside world
+
+    struct rtmsg  *rtm = static_cast<struct rtmsg *>(NLMSG_DATA(nh));
+    ssize_t attrlen = RTM_PAYLOAD(nh);
+    struct rtattr *attr = RTM_RTA(rtm);
+    bool           has_gateway = false;
+    bool           has_destination = false;
+    int            temp_idx = -1;
+
+    /* If we found the correct answer, skip parsing the attributes. */
+    if (!is_del_event && net->ifid_ != -1) {
+      return NL_OK;
+    }
+
+    /* Find the message(s) concerting the main routing table, each message
+     * corresponds to a single routing table entry.
+     */
+    if (rtm->rtm_table != RT_TABLE_MAIN) {
+      return NL_OK;
+    }
+
+    /* Parse all the attributes for a single routing table entry. */
+    for (; RTA_OK(attr, attrlen); attr = RTA_NEXT(attr, attrlen)) {
+      /* Determine if this routing table entry corresponds to the default
+       * route by seeing if it has a gateway, and if a destination addr is
+       * set, that it is all 0s.
+       */
+      switch(attr->rta_type) {
+      case RTA_GATEWAY:
+        /* The gateway of the route.
+         *
+         * If someone every needs to figure out the gateway address as well,
+         * it's here as the attribute payload.
+         */
+        has_gateway = true;
+        break;
+      case RTA_DST: {
+        /* The destination address.
+         * Should be either missing, or maybe all 0s.  Accept both.
+         */
+        const uint32_t nr_zeroes = (net->family_ == AF_INET) ? 4 : 16;
+        unsigned char  c = 0;
+        size_t         dstlen = RTA_PAYLOAD(attr);
+        if (dstlen != nr_zeroes) {
+          break;
+        }
+        for (uint32_t i = 0; i < dstlen; i += 1) {
+          c |= *((unsigned char *)RTA_DATA(attr) + i);
+        }
+        has_destination = (c == 0);
+        break;
+      }
+      case RTA_OIF:
+        /* The output interface index. */
+        temp_idx = *static_cast<int *>(RTA_DATA(attr));
+        break;
+      default:
+        break;
+      }
+
+      /* If this is the default route, and we know the interface index,
+       * we can stop parsing this message.
+       */
+      if (has_gateway && !has_destination && temp_idx != -1) {
+        if (!is_del_event) {
+          net->ifid_ = temp_idx;
+
+          spdlog::debug("network: new default route via if{}", temp_idx);
+
+          /* Ask ifname associated with temp_idx as well as carrier status */
+          struct ifinfomsg ifinfo_hdr = {
+            .ifi_family = AF_UNSPEC,
+            .ifi_index = temp_idx,
+          };
+          int err;
+          err = nl_send_simple(net->ev_sock_, RTM_GETLINK, NLM_F_REQUEST,
+                               &ifinfo_hdr, sizeof (ifinfo_hdr));
+          if (err < 0) {
+            spdlog::error("network: failed to ask link info: {}", err);
+            /* Ask for a dump of all links instead */
+            net->want_link_dump_ = true;
+          }
+
+          /* Also ask for the address. Asking for a addresses of a specific
+           * interface doesn't seems to work so ask for a dump of all
+           * addresses. */
+          net->want_addr_dump_ = true;
+          net->askForStateDump();
+          net->thread_timer_.wake_up();
+        } else if (is_del_event && temp_idx == net->ifid_) {
+          spdlog::debug("network: default route deleted {}/if{}",
+                        net->ifname_, temp_idx);
+
+          net->ifname_.clear();
+          net->clearIface();
+          net->dp.emit();
+          /* Ask for a dump of all routes in case another one is already
+           * setup. If there's none, there'll be an event with new one
+           * later. */
+          net->want_route_dump_ = true;
+          net->askForStateDump();
+        }
+      }
+    }
+    break;
+  }
+  }
+
+  return NL_OK;
+}
+
+void waybar::modules::Network::askForStateDump(void) {
+  /* We need to wait until the current dump is done before sending new
+   * messages. handleEventsDone() is called when a dump is done. */
+  if (dump_in_progress_)
+    return;
+
+  struct rtgenmsg rt_hdr = {
+    .rtgen_family = AF_UNSPEC,
+  };
+
+  if (want_route_dump_) {
+    rt_hdr.rtgen_family = family_;
+    nl_send_simple(ev_sock_, RTM_GETROUTE, NLM_F_DUMP,
+                   &rt_hdr, sizeof (rt_hdr));
+    want_route_dump_ = false;
+    dump_in_progress_ = true;
+
+  } else if (want_link_dump_) {
+    nl_send_simple(ev_sock_, RTM_GETLINK, NLM_F_DUMP,
+                   &rt_hdr, sizeof (rt_hdr));
+    want_link_dump_ = false;
+    dump_in_progress_ = true;
+
+  } else if (want_addr_dump_) {
+    rt_hdr.rtgen_family = family_;
+    nl_send_simple(ev_sock_, RTM_GETADDR, NLM_F_DUMP,
+                   &rt_hdr, sizeof (rt_hdr));
+    want_addr_dump_ = false;
+    dump_in_progress_ = true;
+  }
+}
+
+int waybar::modules::Network::handleEventsDone(struct nl_msg *msg, void *data) {
+  auto net = static_cast<waybar::modules::Network *>(data);
+  net->dump_in_progress_ = false;
+  net->askForStateDump();
+  return NL_OK;
 }
 
 int waybar::modules::Network::handleScan(struct nl_msg *msg, void *data) {